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M5481 Datasheet(PDF) 3 Page - STMicroelectronics |
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M5481 Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 8 page M5481 3/8 3 - STATIC ELECTRICAL CHARACTERISTICS (Tamb within operational range, VDD=4.75V to 13.2V, VSS=0V, unless otherwise specified) Note 1 Output matching is calculated as the percent variation from Imax+Imin/2 Note 2 With a fixed resistor on the brightness input some variation in brightness will occur from one device to another. Note 3 Absolute maximum for each output should be limited to 40mA. Note 4 the Vo voltage should be regulated by the user. 4 - FUNCTIONAL DESCRIPTION The M5481 uses the M5450 die which is packaged to operate 2-digit alphanumeric displays with mini- mal interface with the display and the data source. Serial data transfer from the data source to the dis- play driver is accomplished with 2 signals, serial data and clock. using a format of a leading “1” fol- lowed by the 35 data bits allows data transfer with- out an additional load signal. The 35 data bits are latched after the 36th bit is complete, thus providing non-multiplexed, direct drive to the display. Outputs change only if the se- rial data bits differ from the previous time. Display brightness is determined by control of the output current for LED displays. A 1nF capacitor should be connected to brightness control (pin 9) to pre- vent possible oscillations. A bloc diagram is shown on Figure 1. The output current is typically 20 times greater than the cur- rent into pin 9, which is set by an external variable resistor. The latter is an internal limiting resistor of 400 Ω nominal value. Figure 2 shows the input data format. A start bit of logical “1” precedes the 35 bits of data. At the 36th clock a LOAD is generated synchronously with the high state of the clock, which loads the 35 bits of the shift registers into the latches. Symbol Parameter Test Conditions Min Typ Max Unit VDD Supply Voltage 4.5 13.2 V Idd Supply Current VDD=13.2V 7 mA Vi Input Voltages Logical “0” Level Logical “1” Level +10 µA Input Bias 4.75 ≤V DD≤5.25 VDD>5.25 -0.3 2.2 VDD- 2 0.8 VDD VDD V V V IB Brightness Input Current (Note 2) 0 0.75 mA VB Brightness Input Voltage (pin9) Input Curren=750 µA Tamb=25°C 3 4.3 V Vo(off) Off-state Output Voltage 13.2 V Io Output Sink Current (Note 3) Segment OFF Segment ON Vo=3V Vo=1V (Note 4) Brightness In.=0 µA Brightness In.=100 µA Brightness In.=750 µA 0 2 12 2.7 15 10 10 4 25 µA µA mA mA fclock Input Clock Frequency 0 0.5 MHz Io Output Matching (Note 1) ±20 % |
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